Displaying 1 - 25 out of 275 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Achillea millefolium L. | F. Petrak 50012 | 7. VIII | United States of America | Wyoming | Brooklyn Lake | — |
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| Aglaospora profusa (Fr.) De Not. | F. Petrak s.n. | s.d. | Czech Republic | — | bei Mährisch-Weisskirchen | — |
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| Albertiniella reticulata Kirschst. | F. Petrak s.n. | Sep 1932 | Austria | — | Weisskirchen | — |
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| Allantoporthe tessella (Pers.) Petr. | F. Petrak s.n. | Jul. | Germany | — | Seebach prope pagum Lunz | — |
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| Allantoporthe tessella (Pers.) Petr. | F. Petrak s.n. | Nov. | Ukraine | — | Stryi | — |
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| Allantoporthe tessella (Pers.) Petr. | F. Petrak s.n. | Apr. | Ukraine | — | Stryi | — |
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| Ambrosia tomentosa Nutt. | F. Petrak 50147 | 04 Aug 1950 | United States of America | South Dakota | Pennington Co. Roadside near Rockerville,… | — |
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| Amorpha nana Nutt. | F. Petrak 50073 | 03 Aug 1950 | United States of America | South Dakota | roadside Hwy 85, south of… | — |
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| Androsace septentrionalis L. | F. Petrak 50190 | 08 Aug 1950 | United States of America | Wyoming | Albany Co. near Brooklyn Lake,… | — |
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| Anthostoma bavaricum Petr. | F. Petrak s.n. | Aug 1925 | Czech Republic | — | Moravia, M. Weisskirchen | type |
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| Anthracoidea arenaria (Syd.) Nannf. | F. Petrak s.n. | — | Czech Republic | — | Moravia orient. pr. Mähr. -… | — |
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| Aplosporella tiliacea var. dubia Petr. | F. Petrak s.n. | 26 Oct 1914 | Czech Republic | — | MoraviaM. - Weisskirchen | type |
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| Arctostaphylos uva-ursi (L.) Spreng. | F. Petrak 50253 | 04 Aug 1950 | United States of America | South Dakota | Custer Co. Woods, roadside, Hwy.… | — |
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| Arenaria fendleri A.Gray var. fendleri | F. Petrak 50048 | 12 Aug 1950 | United States of America | Wyoming | Albany Co. Stoney roadside, Hwy… | — |
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| Arnica cordifolia Hook. | F. Petrak 50129 | Aug. 8 .950 | United States of America | Wyoming | Albany Co. Nash Fork Creek,… | — |
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| Artemisia longifolia Nutt. | F. Petrak 50103 | 04 Aug 1950 | United States of America | South Dakota | Jackson Co. Badlands National Park,… | — |
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| Artemisia longifolia Nutt. | F. Petrak 50106 | 04 Aug 1950 | United States of America | South Dakota | — |
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| Artemisia scopulorum A.Gray | F. Petrak 50119 | 07 Aug 1950 | United States of America | Wyoming | Albany Co. shore of Brooklyn… | — |
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| Ascochyta galeobdolina Petr. [ined.] | F. Petrak s.n. | May 1924 | Czech Republic | — | Moraviaeastern Moravia, exact location illegible | taxon ined. |
![Ascochyta galeobdolina Petr. [ined.]](https://sweetgum.nybg.org/images3/1717/432/01097091.thumb.jpg)
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| Ascochyta vindobonensis Petr. | F. Petrak s.n. | Jun 1940 | Austria | Lower Austria | Niederösterreich. Pfaffstättnerkogel near Baden | type |
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| Asteromella velata Petr. | F. Petrak s.n. | Sep 1940 | Austria | Lower Austria | Niederösterreich. Hundsheimerkogel near Hainburg | type |
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| Betula papyrifera Marshall | F. Petrak 50167 | 13 Aug 1950 | United States of America | South Dakota | Custer Co. In gully below… | — |
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| Biscogniauxia atropunctata (Schwein.:Fr.) Pouzar | F. Petrak s.n. | May 1950 | United States of America | Maryland | Beltsville. | — |
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| Biscogniauxia atropunctata (Schwein.:Fr.) Pouzar | F. Petrak s.n. | May 1950 | United States of America | Maryland | Beltsville. | — |
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| Calosphaeria abnormis (Fr.) Höhn. | F. Petrak s.n. | Aug 1914 | Austria | — | Weisskirchen | — |
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